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| author | Alan Stern <stern@rowland.harvard.edu> | 2009-06-29 11:00:01 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-09-23 06:46:23 -0700 |
| commit | ccf5b801cef4f9e2d708d3b87e91e2bc6abd5206 (patch) | |
| tree | 1b7de13df336f44f6f74657934e79dc8c0bfd142 /include/linux/usb.h | |
| parent | 7cbe5dca399a50ce8aa74314b1d276e2fb904e1b (diff) | |
| download | lwn-ccf5b801cef4f9e2d708d3b87e91e2bc6abd5206.tar.gz lwn-ccf5b801cef4f9e2d708d3b87e91e2bc6abd5206.zip | |
USB: make intf.pm_usage an atomic_t
This patch (as1260) changes the pm_usage_cnt field in struct
usb_interface from an int to an atomic_t. This is so that drivers can
invoke the usb_autopm_get_interface_async() and
usb_autopm_put_interface_async() routines without locking and without
fear of corrupting the pm_usage_cnt value.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'include/linux/usb.h')
| -rw-r--r-- | include/linux/usb.h | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/include/linux/usb.h b/include/linux/usb.h index 3b45a0d27b80..a34fa89f1474 100644 --- a/include/linux/usb.h +++ b/include/linux/usb.h @@ -195,7 +195,7 @@ struct usb_interface { struct device dev; /* interface specific device info */ struct device *usb_dev; - int pm_usage_cnt; /* usage counter for autosuspend */ + atomic_t pm_usage_cnt; /* usage counter for autosuspend */ struct work_struct reset_ws; /* for resets in atomic context */ }; #define to_usb_interface(d) container_of(d, struct usb_interface, dev) @@ -551,13 +551,13 @@ extern void usb_autopm_put_interface_async(struct usb_interface *intf); static inline void usb_autopm_enable(struct usb_interface *intf) { - intf->pm_usage_cnt = 0; + atomic_set(&intf->pm_usage_cnt, 0); usb_autopm_set_interface(intf); } static inline void usb_autopm_disable(struct usb_interface *intf) { - intf->pm_usage_cnt = 1; + atomic_set(&intf->pm_usage_cnt, 1); usb_autopm_set_interface(intf); } |